The RM 5600 XT works fine with standard settings of 40-41 megahash.
If you need to get a higher hash rate, then you need to flash the BIOS of the video card. Then you can get 44-45 megahash.
Different video cards may have problems, for example, the video output stops working, so you need to read the forums for each of the models.
I must have 4 bad 5600 XT cards. Running with the stock settings "core clock 1700" and "memory clock 1750" and the Power override via Afterburner set @ "power limit -10%" the best I get is ~38.2M/H.
Use a lower core clock like 1000. The 5600 XT is heavily memory bandwidth limited so you don't need to run the core very high.